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I just noticed the ticking sound with start, it was quiet loud.
I didn't notice it before, but noticed it when I started my car in quiet parking garage yesterday morning.

I'm thinking, it is a belt problem. I thought, it's normal to hear ticking sound with a first start in cold weather in the morning but it should go away with a short warm up.
But this ticking noise was quite loud and didn't go away with 2min warm up. It was it was ticking faster when I was running my car.

I have 2008 328i, around 30,000 miles, I rarely drive it and i'm a gentle driver. There's no warning sign, everything is up to date, I just changed my engine oil in march.
And the check screen says, "CHECK OK".

I'm out of manufacture's warranty now, I try do things on my own if possible =)
Do I need to take my car to shop?

This site is so great, and has been helping me tons! Thank you very much in advance to those experts *^^*

The noise was diagnosed as an exhaust side bucket hydraulic valve lifter issue as well as a complete replacement of the head if needed. Search and you'll find a lot of information here, but basically this is going to cost you if out of warranty.

Yeah that's a big issue, I had a 06 325 with the same problem. It will only get worse trust me. I swore they fixed this factory defect after 07. Believe it or not 'babying' a BMW too much is never good, and BMW NA fix for this is literally to drive the car harder and it will help. The valves will eventually fail though. When mine failed it was still under cpo but the invoice showed 3500 in repairs.... I promptly traded it as is for an E60

The noise was diagnosed as an exhaust side bucket hydraulic valve lifter issue as well as a complete replacement of the head if needed. Search and you'll find a lot of information here, but basically this is going to cost you if out of warranty.

As it was explained to me. It's a factory defect. Air seeps in with the hydraulic fluid for the lifters, this causes the lifters to lash and eventually the lifter stops working all together. It happened to me one morning, cylinder 1 exhaust valves were stuck open.

i drive a 2008 328i as well. i experienced this same problem a while ago - probably around 30,000 miles too. i took it in to the dealer but they couldn't identify the problem. i tried to ignore it and after a while the ticking sound disappeared. i'm at close to 80K miles now and haven't heard it in years.